Automatically-variable-speed fan for motor-cars



June 17, 1930. P. E.l M. J. sAuTAl AUTOMATICALLYv VARIABL SPEED FAN FOR MOTOR CARS Filed May 17, 1929 www M Patented June 17, 1930 UNITED. STATES PIERRE EDOUARD MAR-1E JOSEPH, SAUTAI, OF AMIENS, IEIR'AIN'CHE.`

AUTOMATICALLY-VARIABLE-SPEED EAN FOR MOTOR-CARS Application filed May 17, 1929, Serial No. 363,934, and in France June 28, 1928,

The primary object of the invention is to assure that the cooling of the engine of a motor-car shall be constant.

A further object is to provide a fan, for

cooling the engine of a motor-car, the rotary speed of which varies automatically as the car puts on speed or slows down and as the engine turns at a quicker or slower rate in such a way that the degree of cooling will be continually the same.

A fan according to the invention possesses the characteristic features specied in the following description and especially in the claims annexed at the end thereof.

A fan according to the invention is shown, by way of example, in the accompanying drawings, wherein F ig. 1 is a longitudinal section of the mechanism for driving the fan;

Fig. 2 is a transverse section taken on the line 2-2 of Fig. l; and

Fig. 3 is a front View of the casing of the mechanism for driving the fan according to an embodiment of the invention.

The fan shown in Figs. l and 2 consists essentially of blades l fitted on a hub 2 carried by a shaft 3, the shaft being mechanically connected to a toothed plate 4. A shaft 5 connected to operate synchronously 30 with the wheels of the vehicle (for example,

through the agency of the transmission shaft between the gear box and the rear axle) is provided with a toothed plate 6 opposite plate 4. The end of shaft 5 turns in a y bearing 7 situated in the centre of plate 4. Plates 4 and 6 mesh with the toothed pinions 8', 82, 83, 8* carried by a cross-piece 9 which is freely rotatable upon shaft 5, the rotary cross-piece being fitted in a casing l0 which rotates about thfe axis XX about which plates 4 and 6 rotate. The rotary motion of the cross-piece is mechanically transmitted thereto from the car engine, for example, by a sleeve fixed to the casing 10, the said sleeve being connected by a toothed gear or chain to the engine, or by a crown wheel 11 on the casing 10 gearing with a pinion 12 rotatable with the engine.

This differential gear is disposed in an oil-tight casing, not shown in the drawing, which is suitably lled with. oil'.

Evidently ball bearings canbe used: if necessary instead of the smooth bearings shown` in the drawing.

The operation ofthe fan and' its. dr-iving D mechanism as thus constructed is as fol'l lows The plate. 6 and the rotary crossfpiece 9 rotate. in. the same direction'when the car L 'velocity ofthe car.

Thus, the. fan has as many speeds. as there arediiferent ratios. between the rotary speed of the. engine and the velocity. of the car, viz, as` many speeds as there arey combinations in the gear box plus a speed corre'- spondling to the idleV running ofthe engine whenl the car is stationary. If, for example, the fany is fittedv on a car having a fourspeed gear box with av reversing gear, the fan willi have six different rates of speed.

It will rotateatv its minimum speed when the car is running in. itstop. or direct gear, when the cooling due to the actual velocity of the car is greatest. On the contrary, it willi rotate at its maximum speed when the car is. reversing, as at that time the actual movement ofthe vehicle does-not causev any appreciable cooling. Between these two. extremesV there are different rates ofV speed f or the fan according as the. car runs. in 3rd, 2nd, or 1st gearor as the. engine runs idle. The gear ratio between. thediferential, on the one hand, and the fan, the en ine and the wheels, on. the other hand', shou rd'be. calculated for each type of carand'. en ine. Likewise the dimensions' and`A number ofthe fan. blades. These. features.- should prefer.-

ably be calculated to assure sufficient cooling in the hottest summer weather. Associatedwith the fan there may be a shutter, trap or doorfor cutting off the flow of air in cold weather.

What I claim as my invention and desire to secure by Letters Patent is l. In a motor car, a fan for cooling the engine, a rst transmission connecting the fan with the car wheels, a second transmission connecting the fan with the car engine, this arrangementV thus givingthe fanV a rotary speed automatically varying accordingy as the car puts on speed or slows downy anc as `the engine runs with decreased or in-V creased speed the degree of cooling thus remaining constant. v Y

2. In a motor car, a fan for cooling the engine, a firstedifferential planet gear driving the fan, a rotary shaft driven by the transmission shaft between the gear box and the rear axle of the car, a second differential planet gear keyed to said rotary shaft, a rotary casing driven by the engine, satellites carried by said rotary casing and in mesh with said two differential planet gears, this Y arrangement giving the fan a rotary speed automatically varying as the car puts on speed or slows down and as the engine runs with decreased or increased speed, the degree of cooling remaining constant. f

3. In a motor car, a fan for cooling the motor, a first dierential planet gear for driving the fama rotary shaft driven by the transmission shaft between the gear box and the rear axle of the car, a second differential planet gear keyed to said rotary shaft, a rotary casing driven by the engine, a rotary cross-piece fixed on said rotary casing, satellites carried by the arms of said rotary cross-piece and meshing with said two differential planet gears, this arrangement giving the fan a rotary speed which automatically varying as the car puts on speed'- or slows down and as the engine runs with decreased or increased speed, the degree of cooling thus remaining constant.

4. In a motor car,.a` fanv for cooling the engine, a first differential planet gear for Y driving the fan, a rotary shaft driven by thel transmission shaft between the gear box and the rearl axle of the motor car, a second differential planet gear keyed to said yrotary shaft, a rotary sleeve surrounding said rotary shaft and driven by the engine, a casin fixed on said rotary' sleeve,'satellites carrie v by said -rotary casing and meshing with said two differential planet gears, this arrangement giving the fan a rotary speed automatically varying as the car puts on speed or slows down'and asfthe engine runs with decreased -or increased speed the degree of cooling thns remaining constant.

5. In a motor car, a fan for cooling the engine, a first diiferentlal planet gear driving the fan, a rotary shaft driven by the transmission shaft between the gear box and the rear axle ofthe car, a second dierential planet gear keyed to said rotary shaft, a toothed pinion driven by the engine, a casing with a' toothed crown wheel meshing with said toothedy pinion, satellites carried by said rotarypcasing and meshing with said two differential planet gears, this arrangement giving the fan a rotary speed varying automatically as the car puts on speed or slows down and as the engine runs with decreased or increased speed, the degree of cooling thus remaining constant.V y

In testimony whereof I have signed this specification. n

PIERRE EDOUARD MARIE JOSEPH SAUIAI.

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